DP Music

I am looking for information on how DP music programs work at other IB schools. Do you have SL and HL music students in the same DP music class? Do you require that students also be in band and jazz band, or if vocal students it would be choir and concert choir? I am encountering some resistance to DP music here and looking for ideas.

We are a small high school (approx. 530 students)with an excellent music program already in place.